— CHAPTER MASTERY · CLASS 9

Polynomials Important Questions.

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Key Concepts in Polynomials

Types of polynomials: linear, quadratic, cubicZeroes of a polynomial and geometrical meaningRemainder theorem and factor theoremFactorisation using algebraic identitiesDivision algorithm for polynomials

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Polynomials — Important Questions with Answers

Practice these Polynomials questions for Class 9 Mathematics, each with the correct answer and a step-by-step explanation. Sign up free to practice all 67+ questions with adaptive difficulty.

  1. Q1Medium

    What is the degree of a polynomial that is classified as a monomial?

    • A.0
    • B.1
    • C.2
    • D.3
    Answer: 1

    Explanation: A monomial is a polynomial with only one term, and its degree is determined by the exponent of that term. Therefore, the degree of a monomial is equal to the exponent of its variable, which is at least 1 if it is not a constant.

  2. Q2Medium

    Which of the following is a characteristic of a zero polynomial?

    • A.Its degree is 0
    • B.Its degree is 1
    • C.Its degree is not defined
    • D.Its degree is infinite
    Answer: Its degree is not defined

    Explanation: The zero polynomial is unique in that it does not have a defined degree because it does not have any non-zero terms. This makes it different from other polynomials, which have degrees based on their highest power of the variable.

  3. Q3Medium

    What is the result of applying the Factor Theorem if p(a) = 0?

    • A.p(a) is a root
    • B.(x + a) is a factor of p(x)
    • C.(x - a) is a factor of p(x)
    • D.p(a) is undefined
    Answer: (x - a) is a factor of p(x)

    Explanation: The Factor Theorem states that if a polynomial p evaluated at a certain value a equals zero, then (x - a) is a factor of that polynomial. This is a fundamental concept in polynomial factorization.

  4. Q4Medium

    Which of the following polynomials is classified as a binomial?

    • A.x + 1
    • B.x^2 - x^3
    • C.3y^2 + 5y + 7
    • D.2x^3 + 4
    Answer: x + 1

    Explanation: A binomial is defined as a polynomial that contains exactly two terms. The polynomial x + 1 fits this definition as it consists of the terms x and 1.

  5. Q5Medium

    What is the degree of the polynomial 5x^3 - 2x^2 + 3x - 2?

    • A.2
    • B.3
    • C.4
    • D.5
    Answer: 3

    Explanation: The degree of a polynomial is determined by the highest power of the variable present in the polynomial. In this case, the highest power is 3 from the term 5x^3, making the degree of the polynomial 3.

  6. Q6Medium

    Which of the following is a polynomial in one variable?

    • A.4x^2 - 3x + 7
    • B.y^2 + 2
    • C.3^2 t t +
    • D.y + 2y
    Answer: 4x^2 - 3x + 7

    Explanation: A polynomial in one variable must have terms with non-negative integer exponents. The expression 4x^2 - 3x + 7 meets this criterion, while the others do not.

  7. Q7Medium

    Which of the following expressions represents a zero polynomial?

    • A.x + 0
    • B.0
    • C.x^2 - x
    • D.5x - 5
    Answer: 0

    Explanation: A zero polynomial is defined as a polynomial where all coefficients are zero, resulting in the expression being equal to zero for all values of the variable.

  8. Q8Medium

    What is the form of a quadratic polynomial?

    • A.ax + b
    • B.ax^2 + bx + c
    • C.ax^3 + bx^2 + cx + d
    • D.a + b + c
    Answer: ax^2 + bx + c

    Explanation: A quadratic polynomial is defined as a polynomial of degree two, which can be expressed in the form ax^2 + bx + c, where a, b, and c are constants and a ≠ 0.

  9. Q9Medium

    What is the Factor Theorem used for?

    • A.To find roots of equations
    • B.To find factors of polynomials
    • C.To evaluate polynomials
    • D.To classify polynomials
    Answer: To find factors of polynomials

    Explanation: The Factor Theorem states that if p(a) = 0 for a polynomial p(x), then (x - a) is a factor of p(x). This theorem is essential for factorizing polynomials.

  10. Q10Medium

    Which of the following is an example of a cubic polynomial?

    • A.x^2 + 2x + 1
    • B.x^3 - 3x^2 + 2x - 1
    • C.2x + 3
    • D.x^4 - x^2 + 1
    Answer: x^3 - 3x^2 + 2x - 1

    Explanation: A cubic polynomial is defined as a polynomial of degree three. The expression x^3 - 3x^2 + 2x - 1 has a highest degree of 3, making it cubic.

  11. Q11Medium

    What is the degree of the polynomial 4 - y^2?

    • A.1
    • B.2
    • C.3
    • D.0
    Answer: 2

    Explanation: The degree of a polynomial is determined by the highest exponent of its variable. In this case, the highest exponent is 2 from the term -y^2.

  12. Q12Medium

    Which of the following is a binomial of degree 35?

    • A.x^35 - 1
    • B.x^35 + x^2
    • C.x^2 + y^2
    • D.x^3 - y^3
    Answer: x^35 - 1

    Explanation: A binomial is an algebraic expression containing two terms. The expression x^35 - 1 has two terms and the highest degree is 35, making it a binomial of degree 35.

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